Linear conductance of graphene-based p-n junctions with Rashba spin-orbitcoupling is considered theoretically. A square potential step is used to modelthe junctions, while the coupling is introduced in terms of the Kane-Mele model(C.L. Kane and E.J. Mele, Phys.Rev.Lett. 95, 226801(2005)). The main objectiveis a description of electronic transport in junctions where Rashba parameter isnonuniform. Such a nonuniformity can appear when graphene is asymmetricallycovered with atomic layers, or when Rashba coupling is strongly dependent onelectric field. It is shown that conductance is significantly modified by theconsidered nonuniformity, which is most clearly manifested by an anomalousminimum at a certain potential step height.
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